Downdraft-stove.



No. 742,161. PATENTED OCT. 27, 1-903.

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Patented October 27, 1903.

. PATENT "OFFICE.

EDWIN R. OAHOONE, OF TROY, NEW YORK.

DOWNDRAFT-STOVE.

SililGiFICATIOhT forming part of Letters Patent N 0. 742,161, datedOctober 27, 1903.

ilriginal application iiled May 12; 1899, Serial llo. 716,556. Dividedand this application filed March 10, 1902. Serial No. 973550. (Nomodel.)

To 0% whom it may concern.-

Be it known that I, EDWIN R. CAHOONE, a citizen of the United States,residing at Troy, in the county of Rensselaer and State of New York,have invented certain new and useful Improvementsin Downdraft-Stoves;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the figures of reference markedthereon, which form a part of this specification.

This invention relates to improvements in downdraft-stoves, and moreparticularly to the fire-pot, and formsa division of my pendingapplication, filed May12, 1899, Serial No The object of the invention isto provide in a fire-pot structure a series of individualsections havingducts communicating with the.

atmosphere and through which air passes to the fuel for the purpose ofpromoting combustion.

my purpose to provide each section with a head and a reduced extensionextending therefrom to the stove-casing, so that as the products ofcombustion leave the fire-pot toward the exitflue the extensions becomehighly heated thereby, and the ducts being formed in the extensions theair entering from the atmosphere likewise becomes heated and in thiscondition is delivered to the mass of fuel under the influence of thedraft.

A further object of my invention is to introduce air downwardly to thefuel, from whence it is drawn through the body thereof under theinfluence of the draft, in combination with the specific means forintroducing heated air through the fire-pot sections to the mass of fuelfrom the sides-that is to say, by providing an extension and a headtherefor the air in being drawn through the fuel pulls, as it were, theheated-air currents introduced to the fuel sides downwardly below theextensions. Hence when the products of combustion rise to escape itnecessarily follows that the extensions are in the path thereof.

In the embodiment of the invention it is duct.

With these primary objects in view the details employed to carryout thesame will now be described.

In the drawings, Figure 1 is a vertical section of a downdraft-stove,showing the application of my invention. Fig. 2 is a horizontal sectionof the same on the line A A, Fig. 1. Fig. 3 is a detail horizontalsection of a fire-pot section on the line B B of Fig. 1.

Fig. 4 is a detail vertical section of a fire-pot,

illustrating a modification of my invention. Fig. 5 is a detail verticalsection of a modification of fire-pot section. Fig. 6 is a horizontalsection onthe line C G of Fig. 1. I

The numeral 1 represents a stove-casing; 2, a fire-pot; 3, a spaceintermediate the firepot and casing; 4; the exit-flue, and 5 the tubesfor introducing currents of air to the fuel.-

The fire-pot iscomposed of an upper portion 6 and lower portion 7. Theportion 6 is in this instance of'ringlike formation and tapersinternally and bears interior grooves '8, while the portion 7 iscomposed of a plurality ofiudividual sections 10. Each sec- 1 tion 10comprises a hollow head 11, slightly inclined upwardly and on whichrests the upper portion 6. The front of the head has a plurality ofgrooves 12 to permit the free passage of air around the fuel. Extendingoutwardly from the head 11 to the casing. 1 is a reduced hollowextension 13, forming an air- This duct at its mouth somewhat tapers andcommunicates with the hollow head, and as the walls of the latter are ofapproximate bell shape the air is delivered to the fuel in an expandedcondition. When it is borne in mind that the air in entering the duct isdrawn in by the draft with considerable force it becomes condensed, andin the meantime is being highly heated, which adds also to its tendencyto force its way out, with the draft. So that in order to utilize thiscondensed heated air when burning immediately attack the fuel and ignitethe gases, a damper 14: being arranged adjacent the open ends of thesections to regulate the admission of air to the ducts. The individualsections being thus constructed, they are arranged side by side with aslight space 15 between them for the passage of the products ofcombustion. \Vhen thus arranged, the portion 7 forms somewhat of atapering basket-like fire-potheld and braced by the extensions 1.3.

A fire having been started when the parts are assembled, air is fed tothe fuel from the top through the tubes 5, while numerous radial heatedair-currents are fed to the fuel from the sides thereof. The two sets ofaircurrents--those coming from the top and those from the sides-meet andmingle, creating a multiplicity of resistances,which tends to materiallyincrease the grade of combustion. The air-currents from the top whilemixing with those from the sides force the latter downwardly, and byreason of the peculiar shape of the bell there is a tendency to throwthe air toward the center of the fuelbed. However, there is a limit tothis throw, whereupon the draft in ascending to the exitfiue takes holdand pulls the escaping products of combustion out through the spaces 15into the space 3, from whence they escape. Hence all the escapingproducts of combustion contact either directly or indirectly with theextensions 13, absolutely insuring the thorough heating of the air priorto its introduction to the fuel. Moreover, the air-currents from theducts opposite each other, introducing air at varying angles,necessarily forces some of the air-currents between the edges of thefuel,and to allow its passage therebetween and the heads 11 the grooves12 are provided. By this construction it will be seen that it mattersnot what condition the lay of the fuel may be the requirements necessaryto meet the circumstances are presout.

In the modification shown in Fig. 4 the head 11 is covered andperforated, as at 11 The perforations incline downwardly and tend todirect the air toward the center of the fuel.

In the modification shown in Fig. 5 the preferred form and modified formof sections are combined. The action and results being obvious, it isthought further description is unnecessary.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the advantages of my invention willbe readily comprehended by those skilled in the art to which itappertains.

Having thus fully described my invention, what I claim as new is- 1. Afire-pot comprising a plurality of hollow sections, which sections haveair-discharge openings and hollow ducts adapted to extend through theside of a stove.

2. A fire-pot, comprising a plurality of hollow sections having hollowducts adapted to extend through the side of a stove, each of saidsections being adapted to receive a supply of air direct from theatmosphere and deliver the same to the fire-pot, and means for heatingthe ducts. V

3. A fire pot comprising a plurality of spaced-apart sections, eachsection having an extension which has formed therein a duct adapted toreceive a supply of air direct from the atmosphere and deliver the sameto the fire-pot, and means for heating the extension.

4. A fire pot comprising a plurality of spaced-apart sections, eachsection having an extension which has formed therein a duct, said ductcommunicating with and adapted to receive a supply of air from theatmosphere and deliver the same to the fire-pot, the extension beinglocated to be heated by the escaping products of combustion.

5. A fire pot comprising a plurality of spaced-apart sections, eachsection having a head and a hollow radial extension, said extensionbeing smaller in cross-section area than the head, and means for heatingthe radial extension from the under side.

6. A fire-pot comprising a plurality of sections, each of said sectionsbeing formed with a duct which is of tapering formation at its inlet and0f oppositely-tapering formation at its outlet, and means for heatingthe sections.

7. In a stove, the combination with a casing, a fire-pot composed of anupper and lower portion, the lower portion comprising a plurality ofspaced-apart sections each section having an air-duct which communicatesdirect with the atmosphere, the upper portion having its side wallsclosed and resting on the lower portion, and means for heating theair-ducts.

8. In a stove, the combination with a casing, a fire-pot composed of anupper and a lower portion, the lower portion comprising a plurality ofspaced-apart sections, having ducts which communicate with theatmosphere and the fire-pot, the upper portion having its side wallsclosed and provided on its inner walls with a plurality of varyinggrooves coacting with the spaces intermediate the sections of thelowerportion, and means for heating the ducts.

9. In a downdraft-stove the combination with a casing, an exit-flue, afire-pot having a plurality of spaced-apart sections provided with ductswhich communicate with the atmosphere and the fire-pot to deliver heatedair to the fuel, a space being formed intermediate the fire-pot andcasing, means for delivering air to the fuel above the air introwith acasing, a fire-pot having a.plurality of spaced-apart sections providedwith ducts which communicate with the atmosphere and the fire-pot todeliver heated air to the fuel, a space being formed intermediate thefirepot and casing, an exit-flue communicating with said space and at apoint above the sections, and means for delivering individual I currentsof air downwardly to the fuel, said air-currents together with theair-currents delivered through the air-ducts being drawn into andthrough the fuel and around the air ducts under the influence of thedraft.

11. A section for a fire-pot comprising a head, and aradially-projecting reduced hollow extension through which and the headair may pass.

12. A fire-pot comprising a plurality'of

